A year after the events of Midchildan Music. In a remote corner of Bureau territory, ships begin disappearing without so much as a trace. With the population at large unaware of the danger, the explorations of a former Sergeant and his Vocaloid Device take them into contested territory... into a world dominated by a dark Kingdom.

When a random Sergeant in the Time-Space Administration Bureau finds an AI data chip on the ground, he elects to take it with him... but the inhabitant of this particular chip is anything but a normal Midchildan AI.